Jar shoulder knuckle joint



Sept. 18, 1951 I w. H. DUMBLE JAR SHOULDER, KNUCKLE JOINT Filed June 2, 1945 K m W E L M T T a flu w v 3% h Q 4,. 1 z Mum-W M W m z n i E A l a 3 1 14 f/ Patented Sept. 18, i951 UNITED STATES PATENT OFFICE JAB SHOULDER KNUCKLE JOINT William H. Dumble, Bakersfield, Calif.

Application June 2, 1945, Serial No. 597,222

8 Claims.

This invention is a knuckle joint for deep well fishing tools.

Various kinds of tools are employed in deep wells to recover, if possible, loose or frozen apparatus or parts thereof from a well hole.

One object of this invention is to provide a knuckle joint, for fishing tools, which is wholly free from fragile pivot or pin connections between the elements of the joint and which is specially provided with powerful jar-strain sustaining shoulders.

A further object of the invention is to provide a hydraulic motor in the joint to effect its knuckling function. Another object is to provide a device in the assembly to control the flow of pressure fluid in the joint, preferably in the form of a flow-bean type of valve.

Also, an object of the invention is to provide a knuckle joint having from end to end of the assembly a continuous passageway for fluid flow and also for the introduction and operation of a macaroni tool string or other adaptable apparatus.

A desideratum is to provide a heavy duty, simple, substantial, practical, readily operative, reliable and highly compact knuckle joint.

A particular object is to provide a knuckle joint involving but three principal elements all relatively movable in the knuckling of the joint but which have no relative rotation.

The invention consists in certain advancements in this art as set forth in the ensuing disclosure and having, with the above, additional objects and advantages as will be made manifest in the following description of the herewith illustrative embodiment; it being understood that modifications, variations and adaptations may be resorted to within the scope, spirit and principles of the invention as it is claimed in conclusion hereof. v

Figure 1 is an axial section of the joint showing the parts in alined position. Figure 2 is a detail, top plan of the closed bean valve. Figure 3 is a longitudinal section of the joint shell, certain parts being in elevation and in knuckled position. Figure 4 is a sectional detail showing the beam valve in full open position. Figure 5 is a top plan of the empty shell and showing its full ring jar shoulder. Figure 6 is a cross-section on line 6-6 of Fig. 1, looking down.

A housing shell 2 of cylindrical from has on its upper end a threaded coupling 3 for attachment to the next section of a well tool string (not shown) by which the shell may be lowered, raised, and rotated as desired, and supplied with fluid 2 for circulationor to actuate-the joint as will be explained. In the lower portion of the shell is a transverse, circular, bore shoulder d pierced'by a hole 5 having parallel, flat sidewalls 6. Tiltably and non-turnably fitted in this hole is a tumbler 1 the upper end of which has a more or less conic head 8. This head has a basal'shoulder 9 which normally sets flat on the shoulder 4, as shown in Fig. 1', to take the strain when a load is applied in the joint, or for jarring action on the tumbler. The lower end of the tumbler hangs below the shell and has a screw. pin or other suitable joint device I for attachment of desired equipment. The tumbler 'l is adapted to be readily tilted from the coaxial position, Fig. 1, to the inclined position shown in Fig. 3; the shell hole 5 being laterally enlarged at 5a for clearance, of the tipped body 1. The tumbler is tubular formud circulation and forpassage of small tools as needed. I

Simple and reliable means are provided whereby to firmly tilt the tubular member land solidly hold it tilted while the fishing function is carried on. To that purpose a hollow piston l0, having external packing II, is slidably fitted in the upper portion of the shell. The pistonhas on its lower end a transverse wedge l2 presenting an inclined face [3 to and across the upper end of the tumbler head 8; this being materially recessed at H! to clear the Wedge l2 as it descends with a lateral reaction thrust on the engaged top corner of the head 8. The Wedge and the tumblerhead are constantly interlocked against rotation, relatively, in the shell. When the piston moves down the tumbler rocks on the point X of the shoulder 4, Fig. 3, as a fulcrum-and-the head 8 solidly jams on the near side wall of the shell. Meanwhile the lower end of the tumbler is canted well ofi to the opposite side of-the lower end of the shell so that an applied tool equipment is orbited in a wide path while the joint assembly is bodily ro tated by the driving tool string. The piston lil' is motivated by hydraulic pressure head set up in the shell chamber and derived from circulating mud or pump to tilt the tumbler. And while the piston is being driven down it is desirable that circulation be kept up in the hole, if possible. To this intent a dislodgeable choke device, in one form or another, is mounted in the upper end of. the piston for the purpose of ac cumulating a hydraulic pressure head upon the piston. After the pressure has accomplished its function, to tilt the tumbler, the choke is suitably dislodged to make an enlarged clearance way. Here shown is a block l5 fixed in the piston and having a central port IS in the lower end of which is snugly seatable the nose of a diametrically split plug or valve I! having legs 18 pivoted at 19 in an annular nut 20 screwing in threads 2| in the bore of the piston. These legs are constantly outwardly pressed by springs 22.

The nose of the valve I! has a small port 23, formed by the nose parts when these close into the block l5, actinglike a flow ,bean to cut down the volume of liquidfiowand set up a water head pressure on the piston. The nose of the valve I! has suitable packing 2424 to prevent leakage at its seat in the valve, and between the nose parts.

After the fish has been securely engaged and the tumbler has been pulled back into alinement by raising the tool string somewhat the valve I7 is dislodged so that the full area of its port 16 is available for fluid flow and for the passage of working equipment to further operate on the fish. Therefore, the top end of the valve I I has a cross-kerf 25 to receive the nib of a tool T, Fig. 4, by which the valve and the legs thereof, and the nut 20 may be bodily rotated until the valve nose passes below the lower face'of the block whereupon the nose parts will besnapped open by the spring 22, Fig. 4.

Direct line of fluid flow from the piston I0 to the head of the tumber 7 is eifected by means of a wash pipe'26 packed at 2-1 in the bottom of the piston and having a pivot 28 suitably fitted in the bore of the tumbler head 8 to allow for relative tilting action of the'latter. It will be seen that the main joint forming elements have central bores capable c'freadily passing work tools needed to operate on the fish after it has been worked into alinement by the attached fishing instrument (not shown).

What is claimed is:

1. A fishing tool joint assembly including a shell having an open lower end and an internal, annular jarring shoulder adjacent to its bottom, a tumbler having a body part including a tool pin and a head joined by a reduced neck confined by the pin and the head against axial shift and being guided and laterally tiltable in the lower end of the shell and said head lying flat on said shoulder under load tension'on the assembly and. the head fulcrumin-g on one side of the shoulder during tilting action, said tool pin being rigid with the lower end of the body and extending below the shell, and means in the shell for tilting the said head ofi the shoulder; the lower end of the shell including an elongate, parallel wall bearing below said shoulder in which the tumbler body part oscillates and by which the tumbler is rotated with and by theshell.

2. A fishing tool, knuckle joint assembly including a tubular shell having an annular, internal squarely transverse seat forming shoulder near its lower end and flat, parallel side wall faces below the shell bore and said shoulder to form a guideway, and a tumbling'joint member having a to end head with a fiat, transverse bottom shoulder to set on said shell shoulder and connect the shell and said member. to transmit jarring action and to operatively aline the shell and said member, the tumble member being tiltably guided and held against rotation between said faces, and'means operative in the shell to engage said head and rock the said member on seat 4 shoulder; the said member having a part on its lower end to engage the bottom of the shell and stop axial shift of the member upward in either tilted position or alined position thereof.

3. A tubular shell having at its lower end an internal guide, a tool joint member pivotally supported in the shell at a level above said guide, the said member projecting down through and oscillating in the guide without relative rotation, and a hydraulically actuated piston in the shell and operative on said member to tilt it in the guide; said member having spaced stop parts at the ends of the guide to engage the same and prevent axial shift of the axially alined joint member in the guide.

4. The combination of claim 3; said piston having a head with an axial port, a choke including a set of elements seated and longitudinally adjustable in said port and forming a constrictive flow orifice from said port, means for axially shifting said elements in the port to vary the orifice, and means for automatically expanding said elements in and when clear of the said port.

5. The combination of claim 3; said piston having a head with a port of a size to pass a tool apparatus, and a choke consisting of an expansible fiow bean axially movable and seating in said port to control flow and expanding from the port when shifted therefrom to fully clear the port, and means in the piston for axially moving the said bean.

6. In a fishing tool joint, a shell having in its lower end a bore outlet having parallel side walls forming a bearing and having a transvserse shoulder at the top end of said walls and normal to the shell axis, and a tumbling joint member having a neck oscillatively fitted between said walls for rotational drive by the shell and having a head with a fiat bottom shoulder normal to its axis and adapted to squarely seat on the shell shoulder for jar function and to suspensively aline the said member, and a stop part 'on the bottom end of the neck to engage the guide when the said member is either in axial alinement in the shell or is tilted in the guide.

7. In a fishing tool joint, a shell, a piston slidably mounted in the upper end of the shell, a dislodgeable choke in the piston to set up back pressure in the joint for motivation of the piston; said choke being bodily shiftable in the piston to clear its bore.

8. The combination of claim 7; said choke including parts which automatically open when withdrawn from the normal choking position.

WILLIAM H. DUMBLE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,594,668 Gates et al Aug; 3, 1926 1,696,378 Brauer Dec. 25, 1928 1,718,771 Baker June 25, 1929 1,908,174 OGrady May 9, 1933 2,197,019 Monroe Apr. 16, 1940 2,333,802 Lowrey Nov. 9, 1943 

